I’ve struggled to come up with a unique modifier type for summoner staves for a long while. Melee gets size bonuses, ranged gets projectile velocity bonuses, and magic gets mana efficiency bonuses, but what would be unique to summoners?
First idea I had was making summons take up less slots, but the math behind that got weird because you get into fractional slot occupancy and before you can even see the benefits of it you have to already have hardmode levels of slot counts.
Second idea was a twist on the first, making it so you can get 1 or 2 “free summons” from a reforged staff (i.e. summons that don’t occupy a summon slot).
Third idea was aggro range, where minions could be made to chase after enemies at a longer distance from the player.
But just now I thought of a tag-damage multiplier, where a summon with the appropriate boost to their staff could get greater tag damage on whipped enemies than what the whip used would normally provide (10%, 20%, etc.).